hello,

I am trying to communicate with simple camera of my laptop, but some time this code work fine and some time I am getting error.

`#include <opencv2 highgui="" highgui.hpp="">

include <opencv2 imgproc="" imgproc.hpp="">

include <iostream>

using namespace cv; using namespace std;

int main() { VideoCapture stream1(0); //0 is the id of video device.0 if you have only one camera. stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640); stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480); if (!stream1.isOpened()) { //check if video device has been initialised cout << "cannot open camera"; }

//unconditional loop while (true) { Mat cameraFrame; stream1.read(cameraFrame); imshow("cam", cameraFrame); Mat roi = cameraFrame( Rect(150,50,150,250) ); imshow("cam1",roi);

if (waitKey(30) >= 0) break; } return 0; } ` is there any suggestion to overcome this error.

Thank you very much in advance.

hello,

I am trying to communicate with simple camera of my laptop, but some time this code work fine and some time I am getting error.

`#include <opencv2 highgui="" highgui.hpp="">

include <opencv2 imgproc="" imgproc.hpp="">

include <iostream>

using namespace cv; using namespace std;

int main() { VideoCapture stream1(0); //0 is the id of video device.0 if you have only one camera. stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640); stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480); if (!stream1.isOpened()) { //check if video device has been initialised cout << "cannot open camera"; }

//unconditional loop while (true) { Mat cameraFrame; stream1.read(cameraFrame); imshow("cam", cameraFrame); Mat roi = cameraFrame( Rect(150,50,150,250) ); imshow("cam1",roi);

if (waitKey(30) >= 0) break; } return 0; } ` is there any suggestion to overcome this error.

Thank you very much in advance.

hello,

I am trying to communicate with simple camera of my laptop, but some time this code work fine and some time I am getting error.

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
  
include <opencv2 imgproc="" imgproc.hpp="">
 
include <iostream>
 
#include <iostream>
using namespace cv;
using namespace std;std;
  
int main() {
VideoCapture stream1(0);   //0 is the id of video device.0 if you have only one camera.
stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640);
stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
if (!stream1.isOpened()) { //check if video device has been initialised
cout << "cannot open camera";
}}
  
//unconditional loop
while (true) {
Mat cameraFrame;
stream1.read(cameraFrame);
imshow("cam", cameraFrame);
Mat roi = cameraFrame( Rect(150,50,150,250) );
imshow("cam1",roi);imshow("cam1",roi);
  
if (waitKey(30) >= 0)
break;
}
return 0;
}
`